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@ARTICLE{Wang:849793,
      author       = {Wang, Mingjin and Zhu, Tong and Zhao, Defeng and Rubach,
                      Florian and Wahner, Andreas and Kiendler-Scharr, Astrid and
                      Mentel, Thomas F.},
      title        = {{C}loud condensation nuclei activity of {C}a{CO}$_{3}$
                      particles with oleic acid and malonic acid coatings},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {10},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-03905},
      pages        = {7345 - 7359},
      year         = {2018},
      abstract     = {Condensation of carboxylic acids on mineral particles leads
                      to coatings and impacts the particles' potential to act as
                      cloud condensation nuclei (CCN). To determine how the CCN
                      activity of mineral particles is impacted by carboxylic acid
                      coatings, the CCN activities of CaCO3 particles and CaCO3
                      particles with oleic acid and malonic acid coatings were
                      compared in this study. The results revealed that small
                      amounts of oleic acid coating (volume fraction
                      $(vf) ≤ 4.3\%)$ decreased the CCN activity of CaCO3
                      particles, while more oleic acid coating $(vf ≥ 16\%)$
                      increased the CCN activity of CaCO3 particles. This
                      phenomenon has not been reported before. In contrast, the
                      CCN activity of CaCO3 particles coated with malonic acid
                      increased with the thickness of the malonic acid coating
                      $(vf = 0.4–40\%).$ Even the smallest amounts of
                      malonic acid coating $(vf = 0.4\%)$ significantly
                      enhanced the CCN activity of CaCO3 particles from
                      κ = 0.0028±0.0001 to κ = 0.0123±0.0005. This
                      indicates that a small amount of water-soluble organic acid
                      coating may significantly enhance the CCN activity of
                      mineral particles. The presence of water vapor during the
                      coating process with malonic acid additionally increased the
                      CCN activity of the coated CaCO3 particles, probably because
                      more CaCO3 reacts with malonic acid when sufficient water is
                      available.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000433159600008},
      doi          = {10.5194/acp-18-7345-2018},
      url          = {https://juser.fz-juelich.de/record/849793},
}